CVE-2026-21726

MEDIUM

5.3

Description

The CVE-2021-36156 fix validates the namespace parameter for path traversal sequences after a single URL decode, by double encoding, an attacker can read files at the Ruler API endpoint /loki/api/v1/rules/{namespace} Thanks to Prasanth Sundararajan for reporting this vulnerability.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/15/2026

Last Modified4/17/2026

Sourcenvd

Honeypot Sightings0

References

https://grafana.com/security/security-advisories/cve-2026-21726(security@grafana.com)

IOC Correlations

No correlations recorded

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